Combustion-engine.



G, RETTI.

CMBUSTON ENG AE.

.wPLwAJfloN MLED mm1, 1911 ,Q Patented May 1S) bl.

UNTED STATES PATENT GIACOMO RIETTI, OF ZURICH, SW'ITZERLAND.

COMBUSTION-ENGINE.

To eUni/1,0m it may concern nl f.,

Be it known that I, GIACOMO Rm'r'rr, citizen of Bologna, Italy, residing at Zurich', Switzerlanc'l, have invented certain new and useful Improvements in Combustion-En- Lafines, of which the following is a specication.

My invention relates to combustion m0- tors or engines havingr at least two parallel cylinders, wherein the stroke and the coinpression space are varied-simultaneously, so that the degree of compression is uniform for all lengths of stroke. The cranks for two adjacent pistons are arranged at an angie of 180 to each other, and in four-cylinder engines the usual arrangementis to have the two outer and the two inner cranks projected in the same direction.

In the ordinary type of engine, the piston does not travel with a simple harmonic motion, but during the firstt half of its downward stroke, it travels with a faster than 'simple harmonic motion, so that when the crank has turned a quarter revolution, the piston will have moved more than half vway down, and during the next quarter iston is movin0` slower and vice versa so CIK that at lany time the speedsot the respective pistons will not be the same.

I have found that the irregularity above referred to in the respective piston speeds is auginentedby the devices ordinarilyv interposed between iiston and connecting rod for varyingr the clearance. and the ,primary object ot' my invention is designed to correct this defect.

By nieans of my invention the speed oit one ot' the oppositelv movingl pair oi pistons is substantially the saine at all times as that of the other piston. whereby I ani enabled to aceon'iplish the object aimed at.

The invention 'is illastrativelv cxelnplified in the accompani/ing-r drawing, where` Figure 1 diagrammaticallv represents the application of the invention; Fie'. 2 is a side elcvatio.ial view of a motor. -`the motor invention applied thereto; and Fig. 3 view taken at right angles to Fig. 2.

Speccatoneof Letters Patent.

Application led June 1, 1911.

Patented May 5, this., Serial No. 630,623.

in the drawing, D is the cra-nk; E the crank-connecting-rod; K the piston and H the piston rod.

The mechanism for one piston onlyv is shown in one of its extreme positions, and the mechanism for the other piston is assumed to be in the other extreme position indicated by dotted lines, the/cranks being assumed to be at an angle of 1807 to each other.

Tivo bell-crank levers A and B are connected together by means of a short arm C. The. fulcrum t of the lever B is fixed on the shaft G passing through all the cylinders. The t'ulcruin 1 of the lever A is relatively iixed. The fulcruin 1 is movable in a predetermined arc'roin 1 to 1 to vary the piston stroke and the compression space. When the piston strokes are equal the position of the Fulcrum 1 of the lever vA is fixed. At 3 the lever A carries the piston rod H having the piston K, and the pin 2 is connected to the pin 5 otl the lever B by means of thel arm C. The distance of the points 2 and from the fulc'ruin 1 or' the lever A may be determined by calculation or experiment.

The point G of the lever B describes an arc, having the adius Ll-6, about the cen-- ter d. The speed of this point is dependent upon that of the crank D. Point 5 also describes an are,having;` the radius 4 5, about the center For equal radii at-5 thepoint 5 moves at the same speed as point 6. The irregularities resulting from the limited length of the connecting rod and acting on thel movements ot the points G and 5 are compensated tor or equalized by the lever A.

The point 2 of the lever A connected by the arui C with the point 5 describes an arc, li.-iving' the raCius 1 2, about the center l. 'lhe point 3 connected with the piston rod describes annrc,'ha'.ving` the radius 1-3, about theA center 1. lThe direction ot the are ol` the. point 2 as compared to' that of the are ot the point 5 is so chosen that the distant-rs traversed by two oppositely moving:y bodies are more iearly in.accord than are those of the points 5 and 6, or differently expressed, the paths traversed siniultaneouslv b v the two oppositely moving points )QI-and (and the piston connected to the latter) are substantially equal. By adjustin;Y the point 1 to l for a greater piston' stroke. the point 2 passes to 2 and 3 to 3 and the arcs of these points are described about 1 as a center. The movements of The relationofv the paths traversed by the lthese points 2 and 3 are 1n the same relal pistons moving simultaneously is substantion as about fulcrum 1, thisvbeing true of all intermediate positions (that is forall lengths of piston stroke) between 1 and l".

- connected levers is such that the irregularities resulting from the limited length of the crank-connecting-rod are transmitted to the piston in a'greatly reduced degree.

Having n'ow described my invention, what 1 claim as new, and desire to secure by Letters Patent is 1. An internal combustion engine, em-` bodying therein a pluralityv of cylinders, a pistonoperable'- in each cylinder, piston rods connected to said pistons, cranks set 180"y apart, connecting rods 'for said cranks, and

' means interposed betweensaid piston ,rods

and said connecting rods -whereby the relative speeds-at which said piston rods move in directions opposite to each other are rendered uniform. f 2. An internal combustion engine, ein'- bodying therein a plurlity of cylinders, a piston operable in each ylinder, piston rods connected -top'said istons, cranks set l18()o apart, connepting rods for said cranks, and levers interposed between said/piston rods and said connecting rods whereby the relative speeds at which said piston rods move in directions opposite to each other are rendered uniform. l

23. An internal combustion engine, emoflj ing therein a plurality of cylinders, a pieten operable in each cylinder, piston rods connected to said pistons, cran'ks set 180"V apart, connecting rods f said cranks, and a pair of interconnects! levers interposed between said piston rods and said connectin' rods whereby the relative speeds at whie said piston rods move in directions opposite to each other are .rendered uniform.

4. An internal combustion engine, embodying therein a plurality of cylinders, a piston operable in eachvcylinder, piston rods connected to said p'stons, cranks set 180C apart, connecting ro s for said cranks, anda pair of-interconnected bell-crank levers interposed between said-piston rods and ,said connecting rods whereby thc relative speeds at which said piston `rods move in directions opposite to each other are rendered uniform.

I5. An internal combustion engine, embodying therein a plurality of cylinders, a

bwa' i c-d pistonoperable in each cylinder, piston rods connectedA to'said pistons, cranks set 18()O apart, connecting rods for said cranks, le-

vers interposed between said piston rods andI said connecting rods v hereby the relative speeds at which said piston rods move in di rections opposite to each other are rendered uniform, and an arm 'for movably connectingI said levers together. y

v 6'. An internal combustion en `ne, embodying therein a plurality of cy `nders, a piston operable in leach cylinder, piston rods connected to 'said pistons, cranks set 180o apart, connecting rods forsaid cranks, a lever connected to each connecting rod and movable 'about a fixed point, and a lever connected to each piston rod, said last named le vers being-connected to said rst namedf le versand being adjustable relatively'thereto.

7. An internal combustion ,en 'ne,. embodying ,therein a plurality of cy indem, a piston operable in each cylinder, piston rods connected to said pistons, cranks set 180o apart, connecting rodsfor said cranks, a lever for each connecting rod, said levers being movable about fixed points .and each thereof having an arm connected to one of the connecting rods, anda lever for each piston rod, said'rlast named levers being -movable about adjustable fulcrums and each thereof having van arm connected to one of the piston rods.

.8. An internal combustion engine, embodying therein a plurality of cylinders, a piston operable in each cylinder, piston rods connected to said pistons, cranks set 180 apart, connecting rods for said cranks, a bell-crank lever for each connecting rod, 'said levers movable about fixed points and each thereof having an arm connected to one lof the connecting rods, and a bellcrank lever oriieach piston rod, said last named levers being movable about adjust- -able fulcrums and being connected to said first named levers and to said piston rods.

9'. An internal combustion engine, embodying therein a plurality of cylinders, a

piston operable in each cylinder, piston rods connected to said pistons, cranks set 180 apart, connecting rods for said cranks, a bellcrank lever for each vconnecting rod, said levers being,r each movable about a fixed fulcrum and having one arm connected to one of the connecting rods, abell-crank le- .ver for each piston rod, each of said second named levers having one, arm adjustable in sie-mi; named levers, and another ar'm con- 4 to one of the piston rods, and means fo-L eonneclng said rs'; named levers and Seid. second named. levezslo'gether;

1G', An internal combustlon engine, embcsjlng therein a plnrelityo cylinders, a piston operablen ee-cll cylinder, piston rods connecedio said pistons, cranks sei', 180 upm-t, connectingrods for-.said cranks, a bell-crank lever for each connecting rod, solo levers being each movable about a xed :Fulcrum and having one arm connected to one o the connecting rods, a bell-crank le,- vcr for 'each piston rod, each of said second ,ne are of-e cuole 1n an erm of one of the named. levers having one arm adjustable in fthe are of si circle in an armof one of the first named levers, and another arm connectedto one of the piston rods, and an arm connect'ing said first and second -named levers irl-pairs, said erm having one end bearing in 0ne-arm of one of the first named levers and its other 'end being adjustable and servng as a 'fulcrum for one-of the second named levers.

' In testimony whereof I afIX my signature in presence of two Witnesses.

GIACOMO RIETTI.

JOHANNES AUMUND AUGUST RUEGG. 

